I plan to visit Koh Tao & Koh Pha Ngan then across to Krabi, Koh Lanta & Koh Lipe in November, after looking at the travelfish weather map Im a bit concerned its going to be absolutely pissing with rain, Im not a scuba diver however would like to do some snorkelling and generally lazing around beaches, am I better of heading over Pattaya, Trat, Koh Chang way?
November does tend to be wetter in the Tao/Phangan/Samui area.
However November normally sees the wet season ending and (later) ended in other areas.
Statistically (check TRAVELFISH'S great map) and anecdotally it seems to end earlier in the eastern Gulf than the Andaman.
I really like Ko Samet and big Ko Chang - but note they aint good snorkelling-off-the-beach islands. But Ko Whai, south of Chang is - it is a neat island to stay on and can also be visited along with some other good snorkelling spots nearby on daytrips from Chang.
I'm a bit of a fan of the Andaman in November - I've done several trips then and got lots of sunshine along with short storms every second or third day - I'm off there again this Nov. Good snorkelling off the beach at Phi Phi, Ko Ngai, Ko Kradan, Ko Bulon Lae and Ko Lipe.
Pattaya is great if you want to chase rent boys/girls - but aint too hot for nice beaches and snorkelling.